I'm green on this slug reloading. I have 525 Lyman slugs, STS hulls, Herco powder, Claybuster SW250-12 slug wads and Federal 209A primers which from what I've read are hot compared to Winchester 209's. I have no idea where to start charge wise. How much can you safely back off on the powder? Do you increase the charge in .5 grain increments? I've reloaded rifle and pistol ammo for 45 years but never messed with shotgun stuff. School me.